--  @testpoint:opengauss关键字access(非保留)，作为函数名
--关键字不带引号-成功
drop function if exists access;
create function access(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function access;

--关键字带双引号-成功
drop function if exists "access";
create function "access"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function "access";

--关键字带单引号-合理报错
drop function if exists 'access';
create function 'access'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/

--关键字带反引号-合理报错
drop function if exists `access`;
create function `access`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/